fix(dropdown): corrige fluxo de encerramento e restaura foco

Evita chamadas indevidas de close no popup e garante que o foco
retorne ao elemento do dropdown após o fechamento. Torna o método
`hideDropdown` acessível a subclasses e adiciona listener de
fechamento `(p-close)="hideDropdown()"` no template para manter o
estado consistente.

Fixes DTHFUI-11656

Author: luiz-s-vasconcellos

projects/ui/src/lib/components/po-dropdown/po-dropdown.component.html

@@ -26,5 +26,6 @@
   [p-custom-positions]="['bottom-left', 'top-left']"
   [p-size]="size"
   [p-target]="dropdownRef"
+  (p-close)="hideDropdown()"
 >
 </po-popup>

projects/ui/src/lib/components/po-dropdown/po-dropdown.component.spec.ts

@@ -129,7 +129,13 @@ describe('PoDropdownComponent: ', () => {
         icon: undefined,
         removeListeners: jasmine.createSpy('removeListeners'),
         popupRef: {
-          close: jasmine.createSpy('close')
+          close: jasmine.createSpy('close'),
+          showPopup: true
+        },
+        dropdownRef: {
+          nativeElement: {
+            focus: jasmine.createSpy('focus')
+          }
         },
         open: undefined,
         changeDetector: {
@@ -142,6 +148,7 @@ describe('PoDropdownComponent: ', () => {
       expect(fakeThis.icon).toBe('ICON_ARROW_DOWN');
       expect(fakeThis.removeListeners).toHaveBeenCalled();
       expect(fakeThis.popupRef.close).toHaveBeenCalled();
+      expect(fakeThis.dropdownRef.nativeElement.focus).toHaveBeenCalled();
       expect(fakeThis.open).toBe(false);
       expect(fakeThis.changeDetector.detectChanges).toHaveBeenCalled();
     });

projects/ui/src/lib/components/po-dropdown/po-dropdown.component.ts

@@ -60,10 +60,13 @@ export class PoDropdownComponent extends PoDropdownBaseComponent {
     return this.dropdownRef && this.dropdownRef.nativeElement.contains(event.target);
   }
 
-  private hideDropdown() {
+  protected hideDropdown() {
     this.icon = 'ICON_ARROW_DOWN';
     this.removeListeners();
-    this.popupRef.close();
+    if (this.popupRef.showPopup) {
+      this.popupRef.close();
+    }
+    this.dropdownRef.nativeElement.focus();
     this.open = false;
     this.changeDetector.detectChanges();
   }